diff --git a/navalplanner-business/src/main/java/org/navalplanner/business/orders/entities/Order.java b/navalplanner-business/src/main/java/org/navalplanner/business/orders/entities/Order.java
index 4ec165e46..5d5d80ee1 100644
--- a/navalplanner-business/src/main/java/org/navalplanner/business/orders/entities/Order.java
+++ b/navalplanner-business/src/main/java/org/navalplanner/business/orders/entities/Order.java
@@ -148,7 +148,9 @@ public class Order extends OrderLineGroup {
         for (OrderElement orderElement : getAllOrderElements()) {
             Set<TaskElement> taskElements = orderElement.getTaskElements();
             for (TaskElement taskElement : taskElements) {
-                dayAssignments.addAll(taskElement.getDayAssignments());
+                if (taskElement instanceof Task) {
+                    dayAssignments.addAll(taskElement.getDayAssignments());
+                }
             }
         }
         return dayAssignments;